Buffing wheel section



July 13, 1937. E. w. HALL BUFFIG WHEEL SECTION Filed May 28, 1956Patented July 13, 1937 UNITED STATES PATENT OFFICE l V l 2,087,105BUFFING WHEEL SECTION Elisha w. 1mi, Scituate, Mass. Application May28,1936, serial No. sazia .5 claims?, (ci. sl-lss) This inventionrelatesto rotary abrading tools of the class in-which' the abrading isdone by the peripheral surface of the tool, and is more particularlyconcerned with a tool of the laminated typecomprising a series of layersof yielding abrading material such as cloth. The inven-I tion isespecially concerned with a builing wheel section intended to beassembled with other like sections on an arbor, and clamped together byand between clamping plates and nuts threaded onto the arbor to forcethe sections firmly together.

In the use of a buiing wheel of this class, the

character of the work determines the linear speed of cloth, the waste ofmaterial is considerable;

25 Sometimes, the user attempts to sell the sections of reduced diameterto another user whose requirements call for a lower linear speed, butusually, also such other users requirements call for the use of a muchfiner grade of abrasive ma- 0 terial on the cloth. If,` therefore, thewheel section in the hands of the iirst user was treated with a coarseabrasive, it is unsafe for later use calling for a fine. abrasivebecause some of the coarse abrasive remaining on the cloth is likely 35to scratch; the work.

y To obviatethese objections, my invention con- [templates assemblinglayers of cloth of the full /area of the disk, sewing these togetherfrom a 'point near the center to a point near the pe- 40' riphery, thenpunching out a circular piece'which can be sold for use in a smalldiameter bumng wheel, and using the remaining, large diameter ring inmaking up a wheel section in which the ring is attached to a centraldisk which may be 45 made of relatively inexpensive material such aschip board. The assembly and the attachment' of this disk to the clothring is accomplished .without the use of metal which is regarded asdangerous in a bufilng wheel, and yet the construction 50 is such. thatthere is a positive driving 'connection between the disk and the ring,and there is no need of using clamping plates of large diameter,

in fact, plates having a diameter muchlessthan v. the diameter of` thecentraldisk of the wheel 55 section may be employed.

'I'he invention will best be understood by reference to 'the followingdescription of a wheel section embodying the invention, while its sco-pewill be pointed out more particularly in the appended claims.

In the drawing:

Fig'. l is an elevation of a wheel section ernbodying the invention,with certain parts broken away, the better to illustrate the invention;

Fii. 2 is a sectional view on an enlarved scale on line 2-2 of Fig. 1;

Fig. 3 is anelevatlon,` at a reduced scale, .illustrating a laminatedcloth disk whose layers' are sewed together in readiness for punchingout its f central portion; A

. Fig. 4 is an elevation, also at a reduced scale,

illustrating the 'cloth ring with its internal, circum-ferential margin`prepared for attachment to the central disk; and v Fig. 5 is asectional` view, also at a reduced scale,

illustrating the mode of assembling the central disk with the clothring.

Referring to the drawing'and to the embodiment of the inventionillustrated therein by way of example, and having reference at rst' toFig. 3, there is shown a disk I0 composed of a plui rality of layers I2,of cloth firmly united by stitching'them together, as for example, bystitches I4, which may be and herein are arranged in the center to apoint near the periphery. The next ing a ring I6 (see Fig. 4) ofsuitable dimensions v for a large diameter wheel. The disk removed fromthe center may then be sold for use as apart of a small diameter wheel.

The resultant ring I6 is to be attached to a disk I8 (see Fig. 5)preferably of relativelyy inexpensive material such as what 'is known aschip board whose cost is about one eighth of the cost of an equal bulkof cotton cloth. This chip board is usually made of inexpensive rawmaterial such as corn stalks made into thin sheets several of which arebuilt up vto provide the desired thickness of lthe disk,in this caseapproximately the thickness of the ring I6. The layers of chip board areadhesively secured'together as by silicate of soda and constitute afirm, unitarybody. I

i The best Way now known to me to attach the ring I6 and the disk I8together, so that the latter will drive the former, is to cut the ringto provide notches alternating with teeth 22,

and to cut the disk I8 to provide corresponding step is to punch out acentral, circular area, leavfio teeth 24 to lit into the notches 20, andso that the disk can be assembled with the ring by rela'- tive axialmovement (see Fig. 5). Thus it will be evident that the disk and thering, Vof /substantially equal thickness, are interlocked between theirfaces so that relative rotationgis impossible, and yet Without the useof '/rnetallic fastenings which are regarded as dangerous because theyare likely to break and fiy out of a wheel.

Either before or af ter assembling the disk and the ring, the innermargin of the latter is preferably treated with latex which makes itfirm and facilitates the sewing which is to follow and which willpresently be described. To hold the disk and the ring against relativeaxial movement after they have been assembled, two disks 25 ofappropriate material such as canvas are applied to opposite faces,respectively, of the central disk I8, and the diameter of the canvasdisks is sufiicient so that they overlie the ring I6 to a substantialextent, they cover the interlocking teeth and notches, and there issufficient overlap to enable the canvas disks to be secured to theintervening portion of the ring I6, as by stitches 26. Also, if desired,a row of stitches 30 may be placed about a central opening 32 for thespindle, though these stitches are not at all necessary and may beomitted if desired.

Preferably, before applying the canvas disks, they are coated with latexto make them adhere firmly to the central disk and to the ring, and theassembly is placed in a press under high pressure for a short timebefore proceeding with the stitching. Finally, to avoid exposure of thestitches to wear which might occur in the event of accidental relativerotation of sections, I prefer to apply protective disks 34 of cottoncloth adhesively secured, as by animal glue, to the outer faces of thecanvas disks, the diameter of the protective disks being, of course,sufficient to cover the stitches l26.

The wheel section is now complete and may be assembled with other likewheel sections on an arbor and clamped by the usual clamping plates andnuts, vusing relatively inexpensive, small diameter clamping plates Withthe full assurance that the interlocking of the central disk and thesurrounding ring is sufficiently strong to transmit the power. To resistany possible tendency of the ring to expand radially and to interruptthe interlocking, driving connection, the teeth 22 and 24 may be andherein are given a dove-tail formation as shown in Figs. 1 and 4.

Having thus described one embodiment of the invention but Withoutlimitingmyself thereto, what I claim, and desire by Letters Patent tosecure is: 1. A builing wheel4 section comprising, in combination, acentral disk having a hole for a shaft and a continuous, unitary ringabout said disk and vcomposed. of a plurality of annular layers offabric, said disk and said ring being provided, each with alternatingteeth and notches, the teeth of one being received in the notches andarranged for assembly and disassembly by relae tive axial movement ofsaid disk and said ring, and fibrous retaining elements applied. toopposite sides of said disk and ring along said teeth, and notches Iandsecured to said disk and ring.

2. A bufling wheel section comprising, in combination, a fibrous centraldisk having a hole for a shaft, a continuous, unitary ring about saiddisk and composed of a plurality of layers of fabric disposed in planesperpendicular to the axis of said disk and ring, said disk and said.ring being provided with mutually interengaging teeth and notches, oneset on the outer, circumferential surface of the disk, and the other onthe inner, circumferential surface of said ring, and arranged forassembly by relative axial movementof said disk and said ring, andfibrous retaining disks applied to opposite sides of said disk and` ringand overlying said teeth and said notches.

3. A bufng wheel section comprising, in combination, a fibrous centraldisk having a hole for a shaft, a continuous, unitary ring about saiddisk and composed of a plurality of layers of fabric disposed in planesperpendicular to the axis of said disk and ring, said disk and said ringbeing provided with mutually interengaging teeth and notches, one 'seton the outer, circumferential surface of the disk, and the other on theinner, circumferential surface of said ring, and arranged for assemblyby relative axial movement of said disk and said ring, second brousretaining disks applied to opposite sides of said disk and said ring andoverlying said teeth and said notches, and fastening means extendingthrough said retaining disks and through said ring, radially outwardlybeyond said teeth and said notches.

4. A bufiing wheel section comprising, in combination a fibrous centraldisk having a hole for a shaft, a continuous, unitary ring about saiddisk and composed of a. plurality of layers of fabric disposed in planesperpendicular to the axis of said disk and ring, said disk and said ringbeing provided with mutually interengaging teeth and notches, one set onthe outer, circumferential surface of the disk, and the other on theinner, circumferential surface of said ring, and arranged for assemblyby relative axial movement of said disk and said ring, fibrous retainingdisks applied to opposite faces of said disk and ring and overlying saidteeth and f notches, stitches extending through and fastening saidlayers together, stitches extending through said retaining disks andsaid ring radially outwardly beyond said teeth and notches and fibrousprotective disks applied to the outer faces of said retaining disks andoverlying the last-named stitches.

5. A builing wheel section comprising, in combination, a fibrous centraldisk having a hole for a shaft, a continuous, unitary 'ring about saiddisk and Icomposed of a plurality of layers of fabric disposed in planesperpendicular to the axis of said disk and `ring, said disk and said:ring being provided with mutually interengaging teeth and notches, oneset on the outer, circumferential surface of the disk, and the otheronthe inner, circumferential surface of said ring, and arranged forassembly by relative 'axial movement of said disk and said ring, fibrousretaining disks applied to opposite faces of said disk and ring andoverlying said teeth and notches, stitches extending through andfastening saidlayers together, stitches extending through saidretaining' disks and said ring ra- ELISH W. HALL.

.Patent N. 2,087,105.

' (Sea1)ry ,l

ELISHA w. HALL.'

It is xhereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Pagesecond Column, line 25, claim 3, strike ont the Werd "second"; and thatthe saidLetters Patent' should Vbe read with this correction thereinthat the same may conform to the record of the case in the PatentOffice.

Signed Aand sealed this 21st day of September, -A. D.'- 1937.

AHenry Van Arsdale Acting Commissioner of Patents.

July 13, 1937

